So I set out to design a tool that skate wheels attach to and can be mounted on my lathe between centers.
**Before you attempt this project on the metal lathe you should be comfortable with turning cuts, facing cuts, and single point threading. You should also be familiar with feeds and speeds appropriate for your lathe.**
Step 1: Designing the Arbor
•Mount between centers
•Must be very accurate and repeatable
•Must regroove all skate wheels
My sketch shows the mounting arbor where the counter bores of the wheel seat, it also show the taper nut that centers the wheel on the arbor.
Step 2: Machining
Imagine making a "fake skate wheel" that is adjustable for clamping a wheel.
Step 3: Regrooving!!
1. Clamp the arbor in the chuck of the lathe.
2. Mount a wheel on the arbor.
3. Make sure the cutting tool has HIGH positive rake and is on center.
4. Move the tail stock up.
5. Set the lead screw for 20-28 TPI.
Step 4: Making Threads
Since the wheels are made of a soft rubber (urethane) the cutting tool of choice needs to be extremely sharp, be presented on center, and have a high positive rake. This allows for the wheel rubber to be "cut" versus "smashed" as with 0 rake tools. Also since the wheel is 62mm in diameter the surface feet per minute is quite high. This is needed because at low speeds the tool could "tare" the rubber. I would suggest 150-400 rpm.
Feeds and speeds
•20 degreese positive rake,
•.030-.060 depth of cut